Add new custom TLS Extension

[sysheap]

Hello,

I need to exchange further data during the TLS handshake to verify the integrity of the Client and Server. In order to do that I want to implement a new TLS extension. I was wondering if it is possible to add new TLS Extensions when using bc as a TLS provider? (Similar to the OpenSSL function SSL_CTX_add_custom_ext)

And if not do you have any ideas how I could solve my problem? It should be transparent to the application layer and a connection should be still possible if one of the participants doesn't support the extension.

Thank you very much for your help in advance!

Cheers, Maurice